Merge changes from CUPS 1.6svn-r9968.

[thirdparty/cups.git] / cups / debug-private.h

/*
 * "$Id$"
 *
 *   Private debugging macros for CUPS.
 *
 *   Copyright 2007-2010 by Apple Inc.
 *   Copyright 1997-2005 by Easy Software Products.
 *
 *   These coded instructions, statements, and computer programs are the
 *   property of Apple Inc. and are protected by Federal copyright
 *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
 *   which should have been included with this file.  If this file is
 *   file is missing or damaged, see the license at "http://www.cups.org/".
 *
 *   This file is subject to the Apple OS-Developed Software exception.
 */

#ifndef _CUPS_DEBUG_PRIVATE_H_
#  define _CUPS_DEBUG_PRIVATE_H_


/*
 * Include necessary headers...
 */

#  include <cups/versioning.h>


/*
 * C++ magic...
 */

#  ifdef __cplusplus
extern "C" {
#  endif /* __cplusplus */


/*
 * The debug macros are used if you compile with DEBUG defined.
 *
 * Usage:
 *
 *   DEBUG_puts("string")
 *   DEBUG_printf(("format string", arg, arg, ...));
 *
 * Note the extra parenthesis around the DEBUG_printf macro...
 *
 * Newlines are not required on the end of messages, as both add one when
 * writing the output.
 *
 * If the first character is a digit, then it represents the "log level" of the
 * message from 0 to 9.  The default level is 1.  The following defines the
 * current levels we use:
 *
 * 0 = public APIs, other than value accessor functions
 * 1 = return values for public APIs
 * 2 = public value accessor APIs, progress for public APIs
 * 3 = return values for value accessor APIs
 * 4 = private APIs, progress for value accessor APIs
 * 5 = return values for private APIs
 * 6 = progress for private APIs
 * 7 = static functions
 * 8 = return values for static functions
 * 9 = progress for static functions
 *
 * The DEBUG_set macro allows an application to programmatically enable (or
 * disable) debug logging.  The arguments correspond to the CUPS_DEBUG_LOG,
 * CUPS_DEBUG_LEVEL, and CUPS_DEBUG_FILTER environment variables.
 */

#  ifdef DEBUG
#    ifdef WIN32
#      ifdef LIBCUPS2_EXPORTS
#        define DLLExport __declspec(dllexport)
#      else
#        define DLLExport
#      endif /* LIBCUPS2_EXPORTS */
#    else
#      define DLLExport
#    endif /* WIN32 */
#    define DEBUG_puts(x) _cups_debug_puts(x)
#    define DEBUG_printf(x) _cups_debug_printf x
#    define DEBUG_set(logfile,level,filter) _cups_debug_set(logfile,level,filter,1)
#  else
#    define DLLExport
#    define DEBUG_puts(x)
#    define DEBUG_printf(x)
#    define DEBUG_set(logfile,level,filter)
#  endif /* DEBUG */


/*
 * Prototypes...
 */

extern int	_cups_debug_fd;
extern int	_cups_debug_level;
extern void	DLLExport _cups_debug_printf(const char *format, ...)
		__attribute__ ((__format__ (__printf__, 1, 2)));
extern void	DLLExport _cups_debug_puts(const char *s);
extern void	DLLExport _cups_debug_set(const char *logfile,
					  const char *level, const char *filter,
					  int force);

#  ifdef __cplusplus
}
#  endif /* __cplusplus */

#endif /* !_CUPS_DEBUG_PRIVATE_H_ */

/*
 * End of "$Id$".
 */